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Investigation of crossed-twin structure formation in magnesium and magnesium alloys

Journal Article · · Journal of Alloys and Compounds
 [1];  [2];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
In this work, the effect of alloying addition on the propensity for twin-twin interactions to transform into crossed-twin structures in magnesium alloys is investigated. A full-field elasto-viscoplastic fast Fourier transform (EVP-FFT) framework combined with a discrete twin model and dislocation density-based hardening law for slip strengths is used to calculate the micromechanical fields in the crystalline matrix around the interacting twins. AZ31 and MgLi alloys are selected along with pure Mg to study the influence of plastic anisotropy in connection with alloying elements. These alloys were selected since their plastic anisotropy measure, which is defined as the ratio between the critical resolved shear stress for pyramidal $$\langle$$c +a$$\rangle$$ and basal $$\langle$$a$$\rangle$$ slip modes, spanned a wide range. To quantify the role of twin thicknesses, we probe a range of impinging twin thicknesses while fixing the recipient twin thickness. The analysis reveals that: (i) the local driving stress for crossed twin structure formation generated from the interaction of the two twins is lower in a low plastically anisotropic material, like a MgLi alloy, than a high plastically anisotropic material like pure Mg and (ii) the critical impinging twin thickness needed to form the crossed twin structure in pure Mg, AZ31 and MgLi alloys is ~0.5, ~0.75 and ~1.5 times the recipient twin thickness. We propose a relationship between the tendency for crossed twin structure formation and the experimentally observed higher ductility in MgLi alloys compared to pure Mg. Finally, one key implication of the findings is that crossed- twin structure formation can be hindered and the ductility of magnesium alloy thereby improved by properly choosing alloying elements that lower the slip strength for pyramidal $$\langle$$c + a$$\rangle$$ slip.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1906032
Alternate ID(s):
OSTI ID: 1899397
Report Number(s):
LA-UR-22-31654
Journal Information:
Journal of Alloys and Compounds, Journal Name: Journal of Alloys and Compounds Vol. 935; ISSN 0925-8388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (85)

Observation of Twin Transmission Process in Mg Alloys by In Situ EBSD journal March 2019
The association of twinning and fracture in bcc metals journal March 1981
Slip, twinning, and fracture in hexagonal close-packed metals journal March 1981
Magnesium and its alloys applications in automotive industry journal November 2007
Coupling a discrete twin model with cohesive elements to understand twin-induced fracture journal February 2021
Modelling the nucleation and propagation of cracks at twin boundaries journal December 2021
Promotion of texture weakening in magnesium by alloying and thermomechanical processing: (I) alloying journal October 2013
Transmission electron microscopy investigation of 〈c+a〉 dislocations in Mg and α-solid solution Mg-Li alloys journal March 2002
In-Situ TEM Observation of Twinning and Detwinning During Cyclic Loading in Mg journal April 2013
Effect of Stress Triaxiality on the Flow and Fracture of Mg Alloy AZ31 journal February 2014
The accommodation around {101̄2} 〈1̄011〉 twins in magnesium journal April 1966
A review of mechanical twinning in body-centred cubic metals and its relation to brittle fracture journal August 1965
A numerical method for computing the overall response of nonlinear composites with complex microstructure journal April 1998
Review on Research and Development of Magnesium Alloys journal October 2008
N-site modeling of a 3D viscoplastic polycrystal using Fast Fourier Transform journal August 2001
Application of texture simulation to understanding mechanical behavior of Mg and solid solution alloys containing Li or Y journal December 2001
Orientation image-based micromechanical modelling of subgrain texture evolution in polycrystalline copper journal September 2008
First-principles data for solid-solution strengthening of magnesium: From geometry and chemistry to properties journal October 2010
The effect of twin–twin interactions on the nucleation and propagation of twinning in magnesium journal June 2013
Twin–twin interactions in magnesium journal September 2014
The effect of high yttrium solute concentration on the twinning behaviour of magnesium alloys journal January 2015
Numerical study of the stress state of a deformation twin in magnesium journal February 2015
In situ X-ray diffraction and crystal plasticity modeling of the deformation behavior of extruded Mg–Li–(Al) alloys: An uncommon tension–compression asymmetry journal March 2015
Effect of Ag on interfacial segregation in Mg–Gd–Y–(Ag)–Zr alloy journal August 2015
A statistical analysis of the influence of microstructure and twin–twin junctions on twin nucleation and twin growth in Zr journal August 2015
Effect of local stress fields on twin characteristics in HCP metals journal September 2016
The effect of internal stresses due to precipitates on twin growth in magnesium journal December 2016
Origins and dissociation of pyramidal dislocations in magnesium and its alloys journal March 2018
Structural characteristics of { 1 ¯ 012 } non-cozone twin-twin interactions in magnesium journal October 2018
Role of local stresses on co-zone twin-twin junction formation in HCP magnesium journal April 2019
Toughening magnesium with gradient twin meshes journal August 2020
A dislocation-based constitutive law for pure Zr including temperature effects journal May 2008
An elasto-viscoplastic formulation based on fast Fourier transforms for the prediction of micromechanical fields in polycrystalline materials journal May 2012
Strain rate and temperature sensitive multi-level crystal plasticity model for large plastic deformation behavior: Application to AZ31 magnesium alloy journal August 2016
Elastic anisotropy and yield surface estimates of polycrystals journal August 2009
Effects of rare-earth elements Gd and Y on the solid solution strengthening of Mg alloys journal July 2009
{10–12} Twins across twin boundaries traced by in situ EBSD journal January 2017
Abnormal migration of twin boundaries in rolled AZ31 alloy containing intersecting { 10 1 ¯ 2 } extension twins journal January 2017
A measure of plastic anisotropy for hexagonal close packed metals: Application to alloying effects on the formability of Mg journal February 2017
Twin-twin interactions and contraction twin formation in an extruded magnesium alloy subjected to an alteration of compressive direction journal March 2018
On the ductility of magnesium based materials: A mini review journal July 2019
Review on the effect of different processing techniques on the microstructure and mechanical behaviour of AZ31 Magnesium alloy journal September 2021
Gradient structure induced simultaneous enhancement of strength and ductility in AZ31 Mg alloy with twin-twin interactions journal December 2021
Revealing the role of pyramidal slip in the high ductility of Mg-Li alloy journal December 2021
Effect of microstructure on the nucleation of deformation twins in polycrystalline high-purity magnesium: A multi-scale modeling study journal May 2011
Observations on the intersection between 101̅2 twin variants sharing the same zone axis in deformed magnesium alloy journal November 2015
Tension twin-induced premature fracture mechanism of aging-treated AZ91D magnesium alloy journal February 2021
Towards revealing the relationship between deformation twin and fatigue crack initiation in a rolled magnesium alloy journal September 2021
Effects of twin-twin interactions and deformation bands on the nucleation of recrystallization in AZ31 magnesium alloy journal September 2020
Twinning and the ductility of magnesium alloys journal August 2007
In-situ, ex-situ EBSD and (HR-)TEM analyses of primary, secondary and tertiary twin development in an Mg–4 wt%Li alloy journal July 2014
Toward understanding twin–twin interactions in hcp metals: Utilizing multiscale techniques to characterize deformation mechanisms in magnesium journal September 2014
Texture weakening and ductility variation of Mg–2Zn alloy with CA or RE addition journal October 2015
Deformation and fracture behavior of Mg alloy, WE43, after various aging heat treatments journal September 2017
Role of alloying elements on twin growth and twin transmission in magnesium alloys journal October 2017
Effect of alloying elements on room temperature stretch formability in Mg alloys journal August 2018
Manipulating deformation mechanisms with Y alloying of Mg journal June 2021
Understanding the interaction of extension twinning and basal-plate precipitates in Mg-9Al using precession electron diffraction journal March 2021
The effects of free surfaces on deformation twinning in HCP metals journal June 2021
Twinning pathways enabled by precipitates in AZ91 journal March 2022
An atomic and probabilistic perspective on twin nucleation in Mg journal October 2010
Basal-plane stacking-fault energies of Mg: A first-principles study of Li- and Al-alloying effects journal April 2011
Strengthening and toughening of magnesium alloy by {10−12} extension twins journal January 2012
Relationship between fatigue crack initiation and activated twins in as-extruded pure magnesium journal November 2013
Cyclic deformation and fatigue damage in single-crystal magnesium under fully reversed strain-controlled tension–compression in the [1 0 1 ¯ 0] direction journal February 2015
Crack propagation along grain boundaries and twins in Mg and Mg–0.3 at.%Y alloy during in-situ straining in transmission electron microscope journal January 2018
The {101¯2} non-cozone twin-twin interactions in Mg: A stability and mobility study using 3-D atomistic simulations journal July 2021
Strength and ductility with {10͞11} — {10͞12} double twinning in a magnesium alloy journal April 2016
Characterizing the role of adjoining twins at grain boundaries in hexagonal close packed materials journal March 2019
Reducing deformation anisotropy to achieve ultrahigh strength and ductility in Mg at the nanoscale journal July 2013
Mechanism and energetics of 〈c + a〉 dislocation cross-slip in hcp metals journal September 2016
The interaction of twins and precipitates in a Mg-7.7 at.% Al alloy journal November 1998
Co-zone {1¯012} Twin Interaction in Magnesium Single Crystal journal November 2013
Weight Loss with Magnesium Alloys journal May 2010
Large plasticity in magnesium mediated by pyramidal dislocations journal July 2019
Critical Assessment 6: Magnesium sheet alloys: viable alternatives to steels? journal July 2014
Explaining texture weakening and improved formability in magnesium rare earth alloys journal August 2014
The crystallography and deformation modes of hexagonal close-packed metals journal January 1967
Local microstructure and micromechanical stress evolution during deformation twinning in hexagonal polycrystals journal February 2020
Atomic-level study of twin–twin interactions in hexagonal metals journal April 2020
Anisotropy and Non-Uniformity in Plastic Behavior of AZ31 Magnesium Alloy Plates journal January 2003
Investigation of tensile–compressive yield asymmetry and the role of deformation twin in extruded pure magnesium journal June 2010
In Situ Characterization of the Effect of Twin-Microstructure Interactions on {1 0 1 2} Tension and {1 0 1 1} Contraction Twin Nucleation, Growth and Damage in Magnesium journal October 2020
Faceting and Twin–Twin Interactions in {1121} and {1122} Twins in Titanium journal May 2022
Magnesium Alloys: An Alternative for Aluminium in Structural Applications journal December 2010

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